Abstract
When parasitizing Coleus blumei Benth., grown in quartz sand culture and fed with 0.2, 1 or 5 mM nitrate, the biomass production of Cuscuta reflexa Roxb. was inhibited to a similar extent as that of the host supplied limiting concentrations of nitrate. In the presence of Cuscuta the growth and dry matter increase of the host plant was severely inhibited. However, dry matter production of host plus parasite was only slightly less than or at 0.2 mM nitrate almost the same as that of uninfected Coleus plants. Under all conditions of nitrate nutrition, parasitism by Cuscuta led to a substantial increase in photosynthesis in host leaves under light-saturating conditions and in transpiration. Particularly with 0.2 mM and mM NO3- parasitism by Cuscuta reflexa also led to an increase in the nitrogen concentration in almost all host tissues and to a substantial increase in the chlorophyll concentration of leaves. The total nitrogen content in the system, host plus parasite, was as large with 0.2 and 1 mM NO3- or only somewhat smaller with 5 mM NO3- than that of the unparasitized host. Since the root weight of infected plants was considerably decreased, it followed that nitrate uptake by roots of parasitized plants was substantially increased compared to the uninfected Coleus. Increased photosynthesis and accelerated nitrate uptake are discussed in relation to an increased sink for assimilates and to higher demand for nitrogen in the parasitized plants and to opposing effects of Cuscuta on symbiotically nitrogen-fed hosts.
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Claims 9
Claim · model-written summary
When parasitizing Coleus blumei fed with 0.2, 1 or 5 mM nitrate, biomass production of Cuscuta reflexa was inhibited to a similar extent as that of the host supplied limiting nitrate concentrations.
- Taxon
- Cuscuta reflexa
Cuscuta reflexae0 - Interactor
- Coleus blumei
Coleus scutellarioidese0host - Outcome
- biomass productione0
- Direction
- inhibitede0
- Qualifier
- fed with 0.2, 1 or 5 mM nitratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When parasitizing Coleus blumei Benth., grown in quartz sand culture and fed with 0.2, 1 or 5 mM nitrate, the biomass production of Cuscuta reflexa Roxb. was inhibited to a similar extent as that of the host supplied limiting concentrations of nitrate”
Claim · model-written summary
In the presence of Cuscuta, growth and dry matter increase of the host Coleus blumei were severely inhibited.
- Taxon
- Coleus blumeiColeus scutellarioidese0
- Treatment
- presence of Cuscutae1
- Outcome
- growth and dry matter increasee1
- Direction
- severely inhibitede1
.jpg?width=60){kind=small}
CuscutaNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“When parasitizing Coleus blumei Benth.”
e1“In the presence of Cuscuta the growth and dry matter increase of the host plant was severely inhibited”
Claim · model-written summary
Dry matter production of host plus parasite was only slightly less than, or at 0.2 mM nitrate almost the same as, that of uninfected Coleus plants.
- Treatment
- host plus parasitee0
- Outcome
- dry matter productione0
- Direction
- slightly lesse0
- Qualifier
- at 0.2 mM nitrate almost the samee0
- Comparator
- uninfected Coleus plantse0
ColeusOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“dry matter production of host plus parasite was only slightly less than or at 0.2 mM nitrate almost the same as that of uninfected Coleus plants”
Claim · model-written summary
Under all conditions of nitrate nutrition, parasitism by Cuscuta led to a substantial increase in photosynthesis in host leaves under light-saturating conditions and in transpiration.
- Taxon
- Coleus blumeiColeus scutellarioidese0
- Organ / stage
- host leavese1
- Treatment
- parasitism by Cuscutae1
- Outcome
- photosynthesis in host leaves under light-saturating conditions and in transpiratione1
- Direction
- substantial increasee1
- Qualifier
- Under all conditions of nitrate nutritione1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When parasitizing Coleus blumei Benth.”
e1“Under all conditions of nitrate nutrition, parasitism by Cuscuta led to a substantial increase in photosynthesis in host leaves under light-saturating conditions and in transpiration”
Claim · model-written summary
Parasitism by Cuscuta reflexa, particularly at 0.2 and 1 mM nitrate, increased the nitrogen concentration in almost all host tissues.
- Taxon
- Coleus blumeiColeus scutellarioidese0
- Organ / stage
- almost all host tissuese1
- Treatment
- parasitism by Cuscuta reflexae1
- Interactor
- Cuscuta reflexaCuscuta reflexae1parasite
- Outcome
- nitrogen concentratione1
- Direction
- increasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When parasitizing Coleus blumei Benth.”
e1“Particularly with 0.2 mM and mM NO3- parasitism by Cuscuta reflexa also led to an increase in the nitrogen concentration in almost all host tissues”
Claim · model-written summary
Parasitism by Cuscuta reflexa led to a substantial increase in the chlorophyll concentration of host leaves.
- Taxon
- Coleus blumeiColeus scutellarioidese0
- Organ / stage
- leavese1
- Treatment
- parasitism by Cuscuta reflexae1
- Interactor
- Cuscuta reflexaCuscuta reflexae1parasite
- Outcome
- chlorophyll concentratione1
- Direction
- substantial increasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When parasitizing Coleus blumei Benth.”
e1“parasitism by Cuscuta reflexa also led to an increase in the nitrogen concentration in almost all host tissues and to a substantial increase in the chlorophyll concentration of leaves”
Claim · model-written summary
Total nitrogen content of the host plus parasite system was as large as that of the unparasitized host at 0.2 and 1 mM nitrate, and only somewhat smaller at 5 mM nitrate.
- Taxon
- Coleus blumeiColeus scutellarioidese0
- Treatment
- host plus parasitee1
- Outcome
- total nitrogen content in the systeme1
- Direction
- somewhat smallere1
- Qualifier
- as large with 0.2 and 1 mM NO3-e1
- Comparator
- unparasitized hoste1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When parasitizing Coleus blumei Benth.”
e1“The total nitrogen content in the system, host plus parasite, was as large with 0.2 and 1 mM NO3- or only somewhat smaller with 5 mM NO3- than that of the unparasitized host”
Claim · model-written summary
The root weight of Cuscuta-infected Coleus plants was considerably decreased.
- Taxon
- Coleus blumeiColeus scutellarioidese0
- Treatment
- infectede1
- Outcome
- root weighte1
- Direction
- considerably decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When parasitizing Coleus blumei Benth.”
e1“the root weight of infected plants was considerably decreased”
Claim · model-written summary
Nitrate uptake by roots of parasitized plants was substantially increased compared with uninfected Coleus.
- Taxon
- Coleus blumeiColeus scutellarioidese0
- Treatment
- parasitizede1
- Outcome
- nitrate uptake by rootse1
- Direction
- substantially increasede1
- Comparator
- uninfected Coleuse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When parasitizing Coleus blumei Benth.”
e1“nitrate uptake by roots of parasitized plants was substantially increased compared to the uninfected Coleus”